Café Royal Cocktail Book by W. J. Tarling (1937, p.158)

0.5 partgin — Nicholson's London ginbase
0.1 partPimm's No. 1 — Pimm's No. 1 Cupbase
0.1 partlime cordial — Rose's Lime Juice Cordialdilution
0.3 partdry vermouth — French vermouth, Noilly Pratmodifier
  1. Mix.

Invented by H. F. Smith.